diff --git a/extern/libtomcrypt/src/headers/tomcrypt_custom.h b/extern/libtomcrypt/src/headers/tomcrypt_custom.h
index 99afa02984..d4eb2c2887 100644
--- a/extern/libtomcrypt/src/headers/tomcrypt_custom.h
+++ b/extern/libtomcrypt/src/headers/tomcrypt_custom.h
@@ -50,6 +50,7 @@
 #define LTC_YARROW
 #define LTC_RNG_MAKE_PRNG
 #define LTC_RNG_GET_BYTES
+#define LTC_DEVRANDOM
 
 #define LTC_NO_PK
 #define LTC_MRSA